Z.ai exposes an OpenAI-compatible API at https://open.bigmodel.cn/api/paas/v4. The adapter uses the openai SDK with a custom baseURL and ZAI_API_KEY env var. - Add ZaiAdapter implementing IProviderAdapter with register(), listModels(), healthCheck(), and createCompletion() (streaming via OpenAI-compat API) - Register GLM-5 (128K context, standard tier, tools support) from model-capabilities - Support ZAI_BASE_URL override for custom deployments - Graceful degradation when ZAI_API_KEY is absent - Remove legacy registerZaiProvider() direct-registry method from ProviderService - Export ZaiAdapter from adapters/index.ts Co-Authored-By: Claude Sonnet 4.6 <[email protected]>